This Traveler is ergonomically contoured for an easy grip and a must-have companion for busy days on the run. S'well Travelers feature Therma-S'well technology - a triple-layered, vacuum-insulated construction made of high quality,18/8, food-grade stainless steel walls plus a copper wall layer for superior temperature retention. It means that beverages will stay cold for up to 26 hours or hot for up to 11, while keeping a condensation-free exterior. The 470 ml (16 oz) Travelers are ideal for transporting coffee or staying hydrated on-the-go. BPA and BPS Free. Hand-wash only. By choosing re-usable S'well bottles you can help reduce the use of single-use plastic products that pose a threat to our environment.